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Core Java Interview Questions
Questions Answers Views Company eMail

public class Test { public static void main(String ar[]) { Integer a = 10; Integer b =10; Integer c = 145; Integer d = 145; System.out.println(a==b); System.out.println(c==d); } }

iGate,

7 8310

How to prevent to create multiple objects of a java class?

ASD Lab, TCS,

3 6654

What is OOPS Concept?

Cap Gemini,

1 3615

What is access modifiers?

Cap Gemini,

1 2783

Explain JSP life cycle

Cap Gemini,

1 2340

How do you implement polymorphism in our day to day life?

Cap Gemini,

2363

What is design pattern and there types?

Cap Gemini,

2 4588

What is aggregation?

Cap Gemini,

1 2500

solve this is my problem byte a=40,byte b=50 both add value is 90 this is with in range of byte... byte range is -128to 127.... why this pgm gives error like type mismatch.... package javapgms; public class byte1 { public static void main(String args[]) { byte a=40,b=50; byte c=a+b; System.out.println(c); } } note : dont use int k... a,b,c are in byte range... mind it..

2 4056

Why Static variable required in java?For ex,class A { static int a; int b; } Why static is required?

Ericsson,

5 5799

Why method overloading and method overriding required in java?

Ericsson, Wipro,

1 3594

In collection sorting comparable and comparator interface will be used..but why this two interfaces required..two will work same purpose so why there are two interfaces instead of one?when to use comparator and when to use comparable?

Ericsson,

1 3512

What is OOPs & Why?

3 3048

String is mutable or immutable?

3 4827

INTERVIEW QUESTION FOR ANDROID

1268


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Un-Answered Questions { Core Java }

What are the advantages of java over C++?

225


Is java free for businesses?

170


What is static keyword in java?

156


What is the difference between instanceof and isinstance?

170


Can private method static?

133






What is unsigned char?

144


Explain the difference between treeset and treemap in java?

156


How do you compare characters in java?

143


Can a class declared as private be accessed outside it’s package?

162


Why java is considered dynamic?

195


What do you mean by exception handling in Java?

191


Why should we use singleton pattern instead of static class?

122


Explain the difference between call by refrence and call by value?

195


Explain the features of interfaces in java?

187


What methods are used to get and set the text label displayed by a button object?

166